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US3390518A - Automatic control device - Google Patents

Automatic control device Download PDF

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Publication number
US3390518A
US3390518A US520291A US52029166A US3390518A US 3390518 A US3390518 A US 3390518A US 520291 A US520291 A US 520291A US 52029166 A US52029166 A US 52029166A US 3390518 A US3390518 A US 3390518A
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United States
Prior art keywords
cam
command
notch
gear
lever
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US520291A
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English (en)
Inventor
Negri Emilio
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Individual
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Individual
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B23/00—Arrangements producing acoustic signals at preselected times
    • G04B23/02—Alarm clocks
    • G04B23/08—Alarm clocks operating on successive days without resetting; operating only once in each 24 hours
    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
    • G04C21/20—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by closing a contact to ring an electromechanical alarm

Definitions

  • a control device adapted to give a command of a predetermined duration which is repeatable at pre-established intervals, the command having utility in controlling operation of another device which may be associated with the control device, which includes a rotatabiy supported cam having a notch on the peripheral surface thereof, movable means normally biased into sliding surface engagement with the peripheral surface of the cam and adapted to move into the notch once during each rotational cycle of the cam to produce a command, a manually operated blocking assembly which is settable to effect withdrawal of the movable means from the notch to interrupt the command, the cam being adapted to automatically reset the blocking mechanism to permit a command to be produced during a succeeding rotational cycle of the cam.
  • a general object of the present invention is to provide a control device capable of producing a command for a pre-established length of time, which repeats itself in a cyclic manner with predetermined frequency in spite of interruption of the command by an external control; the command having utility for the periodic and cyclic operation of either electrical or mechanical devices associated with the control device.
  • a more specific object of the present invention is to provide a control device, particularly adapted for use with electric alarm clocks, which establishes a contact at a pro-established time, i.e., every 24 hours, interrupts it automatically after a certain predetermined period of time, and then automatically re-establishes it, even if the contact has been broken by an external control.
  • a control device comprising a speed reducer having as a rotating element thereof, a cam provided with a notch on its peripheral surface; a lever or ratchet member adapted to engage the cam and be rotated periodically or cyclically by the presence of the notch to produce a command; and a blocking assembly adapted to engage the member during the period of time fixed for the command so as to cause the member to be rotated in a direction to interrupt the command, the cam at the end of the period of command assuming a position which effects rotation of the member in the same direction but to a greater extent than the member rotation due to the blocking assembly, whereby permitting disengagement of the blocking assembly from the member and the return thereof to a rest position so as to permit a command to be produced during a subsequent cycle of operation of the device.
  • the cam is formed of an insulated material and has on its peripheral surface adjacent the notch, a protruding area, and the lever or ratchet member is replaced by a pair of adjacently disposed lever arms.
  • the arms are provided with first end portions which are pointed and are adapted to engage the peripheral surface of the cam at closely spaced points, and second end portions which are provided with electrical contacts, the closing and opening of which produces a command which is controlled by the notch of the cam.
  • the blocking assembly which is adapted to engage one of the levers for the purpose of preventing or interrupting closing of the contacts and therefore the producing of the command, is automatically disengaged from the lever after the period for the command by cooperation between the protruding area of the cam and the lever.
  • FIGURE 1 represents a front view of the device according to a first embodiment applied to an alarm clock.
  • FIGURE 2 represents a similar view to FIGURE 1, but with some pieces removed.
  • FIGURES 3 and 4 are rear and front views respectively, of the disc element shown in FIGURE 1.
  • FIGURE 5 is a view illustrating the cam employed in the practice of the present invention.
  • FIGURE 6 represents a side view of a part of the device shown in FIGURE 1.
  • FIGURE 7 shows the plan of improved device according to the second embodiment.
  • FIGURE 8 shows a section of the cam in FIGURE 7 drawn along the line 8-8 of FIGURE 7.
  • FIGURE 9 is a fragmentary view illustrating structural details of the blocking assembly shown in FIGURE 7;
  • FIGURE 10 is a diagrammatic view of an electric alarm circuit adapted to be operated by the device of the present invention.
  • the device according to the present invention includes a peripherally toothed gear 1 which is meshed with gear 6.
  • Gear 1 is provided with an integrally formed hub portion 2 and a forwardly facing frontal circular gear rack 10.
  • Hub 2 is adapted to carry the hour hand, not shown, of a conventional twelve hour clock and is shown as being rotatably supported by clock plates 5, 5'.
  • a cam 12, shown particularly in FIGURES 2 and 5, is freely mounted for rotation on hub 2 and is provided adjacent its peripheral surface with a notch 14, which defines a tooth 15.
  • Cam 12 is further provided with a pinion gear 13, which is disposed within cutout 12' and supported on shaft 13 for rotation about an axis arranged radially of shaft 3, and which is meshed with circular rack of gear 1.
  • a disc is also freely mounted on the hub 2, and disposed adjacent cam 12 with its face, shown in FIGURE 3, turned towards the cam 12.
  • This face has a frontal circular gear rack 21 which corresponds to rack 10 of gear 1 and is adapted to mesh with a diametrically opposite side of pinion 13.
  • the disc 20 has on its other side (FIGURE 4), a peripherally toothed pinion 22 and a hub portion 23, which is adapted to carry a dial for the tappet of an alarm signal, not shown.
  • the dial employed may be divided about its circumference into hours and fractions thereof, and may be viewed through a suitable clock casing window or opening, not shown, having a fixed index or reference mark.
  • a peripherally toothed gear 24 engages with the pinion 22 (FIGURE 1) and this gear has two equal portions on its external surface, one of which is white 24' and one 24 is cross-hatched.
  • toothed wheel 24 is visible through the window in the clock casing mentioned above.
  • the toothed wheel 24 is also engaged with a pinion 25, which is driven through a shaft 26 by a shagreen button 27 on the outside of the alarm clock (FIGURE 6).
  • gear 1 and disc 20 cooperate with pinion 13 to provide a speed reducing mechanism.
  • pinion 25 By rotating pinion 25 by hand, disc 20 is driven by gear 24 through a desired rotation, and thus a supplemental rotation may be imparted the cam 12 to position the tappet dial and cam in the manner to be more fully hereinafter discussed.
  • the movement of the cam 12 is half as fast as that of the gear 1, whereby when gear 1 is turned through a full circle every 12 hours, cam turns a full circle every 24 hours.
  • the device has also a ratchet or lever member 30 with two arms 31 and 32, which turn round a shaft 33. It also has a spring 36, which tends to rotate ratchet 30 in a first or clockwise direction, as viewed in FIGURE 2, thereby tending to maintain the free end of arm 31 in contact with the peripheral surface of the cam 12. Arm 32 of the ratchet 30, in its turn, keeps its free end normally in contact with a spring blade 38, which has one end 37 fixed to the alarm clock plate 5.
  • This blade 38 can constitute, for example, the movable contact of a circuit switch, into which is inserted an acoustic signal.
  • Blade 38 tends to rotate its free end in a clockwise sense, as viewed in FIGURE 1, because of its elasticity, but the ratchet 30 opposes this with the arm 32, when arm 31 is disposed in engagement with the non-notched peripheral surface of cam 12.
  • the device also incorporates a blocking assembly 40 shown particularly in FIGURE 6 as including a stem 44, which is slidably mounted within apertures, not shown, provided in clock plates 5, 5; a head portion 41; an operating button or knob 46; and a suitable spring 43, which is adapted to normally maintain the blocking assembly in an inoperative position or full left position, as viewed in FIGURE 6, with the rear surface of head 41 in abutting engagement with clock plate 5.
  • Head 41 is formed with a cylindrical portion 41' in the surface of which is disposed an annular groove 42, and a frustoconical end portion 41".
  • the device described above operates in the following manner:
  • the length of the alarm signal is determined by the shape of cam 12 due to the fact that upon continued rotation of cam 12 to remove notch 14 from adjacent ratchet 30, the peripheral surface of the cam forces arm 31 and thus ratchet 30 to rotate in an opposite direction or counterclockwise sense, as viewed in FIGURE 2 to return the ratchet to its original position.
  • ratchet arm 32 acts to force the free end of blades 38 to rotate in a counter clockwise direction, as viewed in FIGURE 2, to again open the electrical circuit and interrupt the alarm signal.
  • the alarm signal can also be cut olf by means of an outside control by pressing button 46 of blocking assembly 40 of FIGURE 6.
  • pressing button 46 the stem 44 is pushed to the right, as viewed in FIGURE 6, so as to force the frustoconical head portion 41" into engagement with arm 32 and cause the latter to move in a counterclockwise direction, as viewed in FIGURE 2, and ride onto head cylindrical portion 41', whereafter arm 32 is seated in groove 42 due to the action of spring 36.
  • the device can then start up a new operation cycle and after 24 hours the cycle repeats itself automatically, even in the case of an external interruption of the alarm signal operated in the preceding cycle.
  • control device was described as being part of an alarm clock. This was only to simplify the description, since this device can be used in other apparatus, in which the command produced thereby is u-tilisable for the periodic and cyclic operation of electrical and/ or mechanical devices associated therewith.
  • FIGURES 7 and 9 A second improved embodiment of the device is shown in FIGURES 7 and 9.
  • the ratchet according to the preceding description is replaced by two levers 51 and 61, which are arranged side by side, but in different planes.
  • the cam 12 has in the region of notch 14 a minimum radius R3 and a protruding area 12 of a radius R2, which is greater than the radius R1 of the cam itself.
  • This area 12' is adjacent to the sloped portion 14 of notch 14, and suitably united to the periphery of the cam.
  • Lever 51 with its fulcrum on shaft 53, includes an arm portion 52 having a curved and pointed free end 52' adapted to slide along the peripheral surface of cam 12.; and an arm portion 54 having a curved free end 54'.
  • Lever 61 with its fulcrum on shaft 63 includes arm portions 62 having a curved and pointed free end 62 adapted to slide along the peripheral surface of cam 12; and an arm portion 64 which terminates in an enlargement 64 having on it a pin 65 which engages with the end 54' of lever 51.
  • cam 12 is formed from insulating material and that curved free end 54' of lever 51 and pin 65, carried on lever 61, form the movable contacts of a suitable switch arranged in an electrical alarm circuit, which may be similar to that illustrated in FIGURE 10.
  • levers 51 and 61 serve to replace blade 38.
  • the arms 52 and 62 belonging to levers 51 and 61 respectively differ in such a way that their respective free ends 52 and 62 are in contact with cam 12 at different peripherally spaced points, the distance between said points varying very slightly (some grades or fractions of grades) in relation to the centre of the cam.
  • levers 51 and 61 are such that only lever 51 can be engaged by the head 41 upon setting of blocking assembly (FIG. 9).
  • the manual interruption of a command may be effected by blocking assembly 40, which operates in the same way as in the first embodiment, but only on lever 52.
  • the command may be interrupted by pushing button 46, whereby head 41 Will cause lever 52 to rotate in such a manner that pointed end 52 will be moved from notch 14 and disposed at a distance between R1 and R2 from the centre of the cam. This displacement of the end 54 of arm 54 away from the pin 65, causes the opening of the circuit and the interruption of the command.
  • lever 51 When the area 12' of the cam 12, which has a radius R2, engages end 52, lever 51 is forced to disengage itself from blocking assembly 40 to permit the latter to return to its rest or inoperative position.
  • button 46 connected with blocking assembly 40, is pushed inwards, blocking the arm 52 of lever 51 and restraining the pointed end 52 from entering notch 14. A command does not then take place for that cycle. Thereafter, area 13 of cam 12 functions to free lever 51 from blocking assembly 40 in the manner described above to permit a command to be produced during a succeeding cycle of cam rotation.
  • pin 65 is disclosed as being a contact of a switch, which can close a circuit whose closure happens when end 54' of lever 51 is in contact with it.
  • any suitable means such as spring 51 and'61 may be employed to normally maintain the points 52 and 62' of levers 51 and 61 respectively against cam 12.
  • a control device adapted to produce a command of a predetermined duration which is repeatable at pre-established intervals, said command having utility in controlling operation of another device which may be associated with said control device, which comprises a speed reduction unit including a rotatably supported cam adapted to be driven at a reduced speed, said carn having a notch disposed on the peripheral surface thereof; means normally engageable with said peripheral surface and movable into said notch when presented adjacent thereto upon rotation of said cam, movement of said means with respect to said cam due to the presence of said notch producing said command and said notch determining the duration of said command; and a blocking assembly, said assembly being settable to engage said means so as to interrupt command, said cam being operable to disengage said assembly from said means upon rotation of said cam to remove said notch from adjacent said means, and permit said command to be produced during a subsequent rotational cycle of said cam.
  • said means is a rotatably supported member, said member being normally biased to rotate in a first direction into said notch when presented adjacent thereto, said assembly when set is adapted to engage said member so as to force said member to rotate in an opposite direction, and said cam when rotated to remove said notch from adjacent said member being adapted to rotate said member in said opposite direction through a distance at least equal to that due to said assembly whereby said assembly is disengaged from said member.
  • said speed reduction unit additionally includes a rotatably supported driven gear and a normally stationary gear, said gears and cam being coaxially mounted on a shaft with said gears facing opposing said surfaces of said cam, said cam carrying a rotatably supported pinion, and said gears having facing circular gear racks adapted to mesh with said pinion.
  • said si nal producing mechanism includes an electrical alarm circuit and a spring blade operable to control opening and closing of said alarm circuit, and said command producing movement of said means is adapted to control operation of said spring blade.
  • said means is a rotatably supported member engageable with said blade
  • said blocking assembly includes a movably mounted stem having a head mounted thereon and a resilient means tending to maintain said stem and head in an inoperable position
  • said head having a cylindrical portion disposed adjacent said stern and a frustoconical portion, said cylindrical portion having an annularly extending groove, said groove being adapted to receive said rotatably supported member when said stem and head are moved to set said assembly, and said cam being adapted to remove said rotatably supported member from said groove to permit said resilient means to return said stem and head to said inoperable position.
  • said means is a rotatably supported member engageable with said blade, said member being normally biased to rotate in a first direction into said notch when presented thereto, said assembly when set is adapted to engage said member so as to force said member in an opposite direction, and said cam when rotated to remove said notch from adjacent said member being adapted to rotate said member in said opposite direction through a distance at least equal to that due to said assembly to permit disengagement of said assembly from said member, whereby upon movement of said member in said first direction said blade operates to close said circuit and upon movement of said member in said opposite direction said blade operates to open said circuit.
  • said speed reduction unit additionally includes a rotatably supported driven gear and a normally stationary gear, said gears being coaxially mounted on a shaft with said gears facing opposing side surfaces of said cam, said cam carrying a rotatably supported pinion, said gears having facing circular gear racks adapted to mesh with said pinion, and means adapted to selectively rotate said normally stationary gear to effect selective rotation and adjustment of said cam with respect to said driven gear.
  • said means includes a pair of rotatably supported levers, said levers being disposed in spaced parallel planes, each of said levers having a first end portion normally engageable with said peripheral surface of said cam, said levers hav ing second portions forming cooperating electrical switch contact surfaces the closing of which produces said command, said levers being adapted to be relatively rotated due to the presence of said notch to normally permit closing and opening of said contacts during each rotational cycle of said cam, and said blocking assembly when set being adapted to engage one of said levers to effect opening of said contacts to interrupt producing of said command.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromechanical Clocks (AREA)
US520291A 1965-01-13 1966-01-12 Automatic control device Expired - Lifetime US3390518A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT57665 1965-01-13
IT766565 1965-04-07

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Publication Number Publication Date
US3390518A true US3390518A (en) 1968-07-02

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US520291A Expired - Lifetime US3390518A (en) 1965-01-13 1966-01-12 Automatic control device

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US (1) US3390518A (it)
CH (2) CH501261A (it)
FR (1) FR1463501A (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1921519A1 (fr) * 2006-11-09 2008-05-14 Montres Breguet S.A. Montre-réveil et mécanisme d'affichage de l'heure de réveil

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1339666A (en) * 1971-05-04 1973-12-05 Amf Inc Time switches

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523676A (en) * 1946-07-03 1950-09-26 United States Time Corp Alarm set and stop mechanism
US2646659A (en) * 1951-10-17 1953-07-28 Bruce O Bower Automatic alarm reset mechanism
US2652682A (en) * 1950-04-19 1953-09-22 Wolbarst John Double alarm mechanism
US2939337A (en) * 1958-03-26 1960-06-07 Barber Colman Co Overtravel mechanism for cam actuated switch
US3131267A (en) * 1960-04-08 1964-04-28 Ebauches Sa Clock or watch having an electric contact controlled by the movement
US3192699A (en) * 1963-12-03 1965-07-06 Carol D Stout Dual alarm clock

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523676A (en) * 1946-07-03 1950-09-26 United States Time Corp Alarm set and stop mechanism
US2652682A (en) * 1950-04-19 1953-09-22 Wolbarst John Double alarm mechanism
US2646659A (en) * 1951-10-17 1953-07-28 Bruce O Bower Automatic alarm reset mechanism
US2939337A (en) * 1958-03-26 1960-06-07 Barber Colman Co Overtravel mechanism for cam actuated switch
US3131267A (en) * 1960-04-08 1964-04-28 Ebauches Sa Clock or watch having an electric contact controlled by the movement
US3192699A (en) * 1963-12-03 1965-07-06 Carol D Stout Dual alarm clock

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1921519A1 (fr) * 2006-11-09 2008-05-14 Montres Breguet S.A. Montre-réveil et mécanisme d'affichage de l'heure de réveil
US20080112272A1 (en) * 2006-11-09 2008-05-15 Montres Breguet S.A. Alarm watch and mechanism for displaying the alarm time
US7715281B2 (en) 2006-11-09 2010-05-11 Montres Breguet S.A. Alarm watch and mechanism for displaying the alarm time

Also Published As

Publication number Publication date
CH501261A (it) 1970-12-31
CH28466A4 (it) 1970-09-15
FR1463501A (fr) 1966-12-23

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